Corinthians 11:19: For there must be also heresies among you, that they which are approved may be made manifest among you.
The truth doesn’t come out by suppressing differences. In fact it comes out by them flourishing so that thereby that which God approves He confirms.
The problem is that as far as the RCC is from much truth as revealed in the Bible many other Churches are further even yet. When we finally get it together over the full truth that is revealed in God’s Holy Word then He will be able to confirm us as He has never done before. That will be great.
Right now, though, the RCC is in great fault as it can cause it’s people to miss out in salvation. Salvation comes only through the person of Jesus Christ. It cannot come by being a member of a church and keeping it’s practices. This is not made clear to Catholics. Many are still on the tread mill of works and do not have the peace of their salvation. They are hoping to get to heaven someday based on being good Catholics and doing enough works. This is very, very sad. At least many Evangelical Churches know how to lead their flock into salvation through Christ, His finished work alone.
No, salvation comes by following the Word of God. And God set up a single Church to insure a uniform interpretation and One truth given to Peter and his successors. This truth is acknowledged not only by a vast constellation of brilliant Catholic theologians from Augustine to Aquinas to Newman to Benedict XVI but also by a long list of distinguished Lutheran theologians who have converted to Catholicism. We can’t have every Tom, Dick, and Harry cracking open the pages of the Bible from Al Shaprton to Joel Osteen to every corner street foursquare Church Christian pastor offering us his/her definite interpretation of God’s Word. There cannot be multiple truths.
Christ counseled obedience to authority and also maintained that all authority comes from God. Protestants have rebelled against God's Holy Church and rebellion does not come from God. It is true that salvation comes through Christ and yet Christ maintains that ALL will be judged according to their deeds. Many pay Him lip service and pay no heed to his teachings.